Method for improving processing of high-load n-hexane waste gas by biotrickling filter

Abstract

The invention belongs to the technical field of biological purification for organic waste gas, and discloses a method for improving the processing of high-load n-hexane waste gas by a biotrickling filter. According to the method, activated sludge is adopted to carry out inoculation on the biotrickling filter, domestication is conducted under low-load n-hexane waste gas, after the domestication is finished, the n-hexane waste gas is improved to be within the range of a high load, microorganisms which are domesticated well under the low load are exposed out of the high-load n-hexane waste gas, a bio-surfactant is added in a nutrient solution of the biotrickling filter, the nutrient solution is evenly distributed on padding in the biotrickling filter through a spraying device, and the microorganisms decompose the n-hexane into CO2, H2O and cytoplasm. According to the method, shock load resistance is strong, on the condition that an operation device and the operation condition are not changed for an existing biotrickling filter, the purification effect of the biotrickling filter on the hydrophobe n-hexane waste gas can be improved, the biodegradation rate is increased, the removal efficiency is improved, the operation cost is low, and operation is easy and stable.

Description

technical field [0001] The invention belongs to the technical field of biological purification of organic waste gas, and in particular relates to a method for improving a biological trickling filter to treat high-load n-hexane waste gas. Background technique [0002] Volatile organic compounds (Volatile Organic Compounds, VOCs) are an important class of air pollutants, which have a huge destructive effect on the environment; some VOCs are even carcinogenic and genotoxic, posing a serious threat to human life and health. It also leads to reduced crop yields and damage to forests and ecosystems. VOCs mainly include hydrocarbons, oxygen hydrocarbons, halogenated hydrocarbons, nitrogen hydrocarbons and sulfur hydrocarbons, such as n-hexane, benzene, styrene, etc. Among them, n-hexane is a highly harmful saturated aliphatic hydrocarbon poison with low toxicity, high volatility, high fat solubility and accumulation effect, and it is easy to enter groundwater through sewage discha...

AI Technical Summary

Problems solved by technology

[0004] However, when the conventional biological trickling filter technology is used to treat hydrophobic n-hexane, due to the extremely low solubility of n-hexane in water and almost insoluble in water, there is a problem that it is difficult to effectively treat it. The large mass transfer resistance of VOCs in the biological trickling filter leads to The main reason for the low removal rate, so it is important to develop new methods to improve the biological purification efficiency of high-load n-hexane waste gas

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